I don't have a setup shot (I always neglect to do that

), but it is really quite a simple one and therefore very easy to replicate. The 'bubbles' are just a mix of oil and water which has been randomly dropped/dripped onto, of all things, a CD and hence the refraction/colours seen here. The CD was placed on a table top with camera set up directly above.This particular image was lit with a single flash head from the R1 kit very low and from the bottom left corner. The darker portion at the top right is the clear portion/central hole of the CD.
I took other images with different flash positions and also some with natural window light and no flash. The resulting images are unpredictable and variable and something which I intend to explore further. I am currently seeking an eye dropper or syringe to try and have some degree of control over the placement of the fluid rather than the randomness that is apparent in the images taken so far. Other images can be seen on my zenfolio site (link below) in the Art/Abstract gallery.
Thanks for your comments
